I agree with Aussie240. A capacitor or fluorescent choke in series with the fan should do the trick. The capacitor option is the best bet since this will produce less heat than the choke, is much easier to tweak to get the correct fan voltage, and is less fussy about the amount of line current it passes.
Although the fan motor will probably produce a little more heat on a 50Hz supply, since it is being well cooled by the fan airflow the net effect should not be significant.

Last edited by Paulusgnome; 07/27/07 07:06 PM.

Mark aka Paulus